var _= function(selector) {
    if(selector.index(".") > -1) {
        var v1 = selector.slice(1);
        return document.getElementsByClassName(s1)[0];
    }else
    if(selector.indexof("#") > -1) {
        var v1 = selector.slice(1);
    }
    else {
        return document.getElementsByTagName(selector)[0];
    }
}

var _css = function(selector , property , value) {
    
}